You guys seem to be doing rather well by yourselves, so I'm just gonna throw my 2 cents in (and maybe a few replies )
First of all, my position is that, in theory. abortion is always morally wrong. Basically, I believe it is wrong to deliberately end the life of a human being, and that a fetus is a human being. Conclusion logically follows. Just to add in my responses to what appears to be the most common objections:
1) Don't even bother comparing a fetus to an appendix, or tumor, or whatever other body part. One is clearly a seperate organism: not an "extension" of the mother. Besides, when does the "extension" suddenly gain a seperate right to exist?
2) For those who claim a fetus only has the "potential" to be human, don't kid yourself. A fetus is going to do one of two things naturally. There will either be a miscarriage, and the fetus will accidently die, or it will be born. It will never suddenly stop developing and fail to become a human or something like that. So, in summary, barring accidents and abortions, 100% of fetuses become "persons".
3) To those who do think the fetus is human, yet it is permissible to kill it anyway, I hope you don't remain a threat to society for long.
I believe that the reason behind the majority of abortions (and many problems in our society) is the fact that sex has become such a dirt cheap thing, something anyone, anywhere can and does do. The reason for this is because our society apparantly refuses to believe in consequences. And I don't blame it when all we get is that we are advanced animals with no other purposes than to screw each other and propagate our genes, until we die and disappear forever. We can ignore this assertion to very high degrees, but the fact remains that unless you're serious about religion and have a different answer, this is the philosophy you're living by. A philosophy that teaches humans have no inherent value at all. This is the real reason abortion is so wide-spread. There might be less if we had some respect for ourselves.
I apologize if this sounds confusing. I'm very frustrated because I can't express everything I want to say in a nice and condensed post. But if anybody wants clarification, or just plain wants to argue, I'll be around.